3dgfx code, untested

[metatoy] / src / vga_s.asm

diff --git a/src/vga_s.asm b/src/vga_s.asm
new file mode 100644 (file)
index 0000000..1d8cded
--- /dev/null
+++ b/src/vga_s.asm
@@ -0,0 +1,51 @@
+       section .text
+       bits 32
+
+       global vga_setpal
+vga_setpal:
+       mov ecx, [esp + 8]
+       test ecx, ecx
+       jz .done
+       push ebp
+       mov ebp, esp
+       push ebx
+       mov dx, 3c8h
+       mov eax, [ebp + 8]
+       out dx, al
+       inc dx
+       mov ebx, [ebp + 16]
+.loop: mov al, [ebx]
+       shr al, 2
+       out dx, al
+       mov al, [ebx + 1]
+       shr al, 2
+       out dx, al
+       mov al, [ebx + 2]
+       shr al, 2
+       out dx, al
+       add ebx, 3
+       dec ecx
+       jnz .loop
+       pop ebx
+       pop ebp
+.done: ret
+
+
+       global vga_setpalent
+vga_setpalent:
+       mov dx, 3c8h
+       mov eax, [esp + 4]
+       out dx, al
+       inc dx
+       mov eax, [esp + 8]
+       shr eax, 2
+       out dx, al
+       mov eax, [esp + 12]
+       shr eax, 2
+       out dx, al
+       mov eax, [esp + 16]
+       shr eax, 2
+       out dx, al
+       ret
+
+; vi:set ts=8 sts=8 sw=8 ft=nasm: